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Yesterday I've installed HL2 and played to the 4th chapter... today (after sleep, reboot, and HL2 update [forced by Steam]) I can't start HL2... after the Valve-intro, Windows prompts an error message about a memory location which can't be read.
Here's the message (Windows XP Pro ger.):
I don't think that this is a hardware problem because I haven't done anything terrible against my hardware...
Shall I try to reinstall HL2? Hopefully not (I fear messing up Steam and re-expriencing the long long decryption)